Hot melt foam adhesive system

Details Hot melt foam adhesive system Hot melt foam adhesive system

1981-06-22

1987-07-14

Rolla, Joseph J.

Dispensing

With material treatment or conditioning means

2221465, 222318, 137541, 137542, 417250, 418 9, 418 15, F01C 114, F04C 1504

Patent

active

046797106

ABSTRACT:
A hot melt foam adhesive system including a gear pump wherein gas is mixed under pressure into the molten adhesive and is driven into solution with the adhesive. The gas is supplied to the pump via a one-way check valve operative to prevent the back flow of molten adhesive to a gas flow control valve, regulator, and gauge. The check valve is positioned above the level of the pump so that molten adhesive cannot flow by gravity into the check valve. The check valve is so constructed that it is biased into a closed position by a spring on the gas side of the valve so that adhesive cannot collect around and foul the spring of the valve.

REFERENCES:
patent: 1013158 (1912-01-01), Hahn
patent: 3965860 (1976-06-01), Cone et al.
patent: 4059714 (1977-11-01), Scholl et al.
patent: 4200207 (1980-04-01), Akers et al.

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